<!DOCTYPE html>

<html lang="zh">

<head>

    <meta charset="UTF-8">

    <meta name="viewpor" content="width=deice-width,initial-scale=1.0">

    <title></title>

    <link href="https://cdn.bootcss.com/twitter-bootstrap/4.4.1/css/bootstrap.css" rel="stylesheet">

    <style>
        .row div {
            background-color: lightsteelblue;
            border: 1px red solid;
        }
    </style>

</head>

<body>
    <header>
        <h1>bootstrap练习</h1>

    </header>

    <main>

        <section>
            <h2>容器</h2>

            <div class="container-fluid" style="background-color: darkgrey;">夜景</div>

            <div class="container-md" style="background-color: darkgrey;">夜景</div>

        </section>


        <section>


            <div class="section">


                <div class="container">


                    <div class="row">


                        <div class="col-1">01</div>


                        <div class="col-2">02</div>


                        <div class="col-6">03</div>


                        <div class="col-3">04</div>


                        <div class="col">05</div>


                        <div class="col">06</div>


                        <div class="col">07</div>


                        <div class="col">08</div>


                        <div class="col">09</div>


                        <div class="col">10</div>


                        <div class="col">11</div>


                        <div class="col">12</div>

                    </div>
                    </container>

                </div>

                <div class="container">

                    <div class="row my-3">

                        <div class="col-md-8 mr-3">wo</div>

                        <div class="col-md-3">ccdsfdf</div>

                    </div>

                </div>

                <div class="container">

                    <div class="row justify-content-center">

                        <div class="col-md-8">dcdffd</div>

                    </div>

                </div>

                <div class="container">

                    <div class="row">

                        <div class="col-md-8 offset-md-2">dcdffd</div>

                    </div>

                </div>

                <div class="container">

                    <div class="row justify-content-center">

                        <div class="col-md-8">

                            <div class="container">

                                <div class="row my-3">

                                    <div class="col-md-8 mr-3">wo</div>

                                    <div class="col-md-3">ccdsfdf</div>

                                </div>

                            </div>

                        </div>

                    </div>

                </div>

        </section>

        <section>

            <h2>响应式图片</h2>

            <div class="container">

                <div class="row">

                    <div class="col-8"><img src="http://pn.gexing.com/shaitu/20130303/0938/5132a9a5d1457.jpg"
                            alt="bing星空" class="img-fluid">

                    </div>

                </div>

            </div>

        </section>

    </main>

    </div>

    </section>

    <footer></footer>

</body>

</html>